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OpenAPI Specification

openapi: 3.2.0
info:
  title: Edgepedia Geo API
  version: '1'
  description: Read-only JSON access to the Edgepedia encyclopedia articles. Keyless. 600 requests a minute and 100,000 a day per IP address (429 with Retry-After past that). Free with credit under the Edgepedia Community License 1.0; AI training is open to everyone.
  license:
    name: Edgepedia Community License 1.0
    url: https://www.edgechat.ai/edgepedia/license
  contact:
    url: https://www.edgechat.ai/developers
    name: EdgeChat
    email: olivia.jin@biostate.ai
  x-logo:
    url: https://www.edgechat.ai/assets/edgechat-chestnut-orange-logo-v2.png
    altText: EdgeChat
    backgroundColor: '#FFFFFF'
    href: https://www.edgechat.ai/developers
  x-origin:
  - format: openapi
    version: '3.1'
    url: https://www.edgechat.ai/openapi.json
servers:
- url: https://www.edgechat.ai/api/v1
tags:
- name: Geo
paths:
  /geo:
    get:
      operationId: listGeo
      summary: 'The geography tree: its regions, each with its periods'
      responses:
        '200':
          description: Regions
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ListGeoResponse'
              examples:
                live:
                  summary: GET https://www.edgechat.ai/api/v1/geo
                  description: 'A live answer of 2026-10-07: arrays cut to two items, long text cut with an ellipsis.'
                  value:
                    regions:
                    - id: geo.us
                      label: United States
                      articles: 169678
                      api_url: https://www.edgechat.ai/api/v1/geo/geo.us
                      children:
                      - id: geo.us.tbc
                        label: Before 500 BC
                        articles: 53
                        api_url: https://www.edgechat.ai/api/v1/geo/geo.us.tbc
                      - id: geo.us.t500
                        label: 500 BC to AD 999
                        articles: 79
                        api_url: https://www.edgechat.ai/api/v1/geo/geo.us.t500
                    - id: geo.weu
                      label: Western Europe
                      articles: 104696
                      api_url: https://www.edgechat.ai/api/v1/geo/geo.weu
                      children:
                      - id: geo.weu.tbc
                        label: Before 500 BC
                        articles: 1212
                        api_url: https://www.edgechat.ai/api/v1/geo/geo.weu.tbc
                      - id: geo.weu.t500
                        label: 500 BC to AD 999
                        articles: 5936
                        api_url: https://www.edgechat.ai/api/v1/geo/geo.weu.t500
                    license:
                      name: Edgepedia Community License 1.0
                      url: https://www.edgechat.ai/edgepedia/license
                      summary: Free with credit, commercial use included. AI training is open to everyone. For other uses, organizations over USD 100M in revenue or 100M monthly users license separately.
          headers:
            RateLimit-Policy:
              $ref: '#/components/headers/RateLimit-Policy'
            ETag:
              $ref: '#/components/headers/ETag'
            Last-Modified:
              $ref: '#/components/headers/Last-Modified'
            Content-Digest:
              $ref: '#/components/headers/Content-Digest'
            Edgepedia-Corpus-Version:
              $ref: '#/components/headers/Edgepedia-Corpus-Version'
        '400':
          $ref: '#/components/responses/UnknownParameter'
        '404':
          description: Not found, or the switch for this route is off
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          headers:
            RateLimit-Policy:
              $ref: '#/components/headers/RateLimit-Policy'
        '405':
          $ref: '#/components/responses/MethodNotAllowed'
        '429':
          description: An error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          headers:
            RateLimit-Policy:
              $ref: '#/components/headers/RateLimit-Policy'
            RateLimit:
              $ref: '#/components/headers/RateLimit'
            Retry-After:
              description: Seconds to wait before the next request.
              schema:
                type: integer
        '503':
          description: Briefly unavailable; try again
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          headers:
            RateLimit-Policy:
              $ref: '#/components/headers/RateLimit-Policy'
      parameters:
      - $ref: '#/components/parameters/fields'
      tags:
      - Geo
  /geo/{id}:
    get:
      operationId: getGeo
      summary: One geography node, in the shape of /topics/{id}
      description: A region answers with its periods and no results; a period or a topic under it lists its articles, 30 to a page.
      parameters:
      - name: id
        in: path
        required: true
        schema:
          type: string
        description: A geography id from /geo, a node's `children`, or an article's `geo`. Geography ids start `geo.`.
        example: geo.us
      - name: page
        in: query
        schema:
          type: integer
          minimum: 1
          default: 1
      - $ref: '#/components/parameters/fields'
      responses:
        '200':
          description: The node
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GetGeoResponse'
              examples:
                live:
                  summary: GET https://www.edgechat.ai/api/v1/geo/geo.us
                  description: 'A live answer of 2026-10-07: arrays cut to two items, long text cut with an ellipsis.'
                  value:
                    id: geo.us
                    label: United States
                    path:
                    - id: geo.us
                      label: United States
                      api_url: https://www.edgechat.ai/api/v1/geo/geo.us
                    articles: 169678
                    children:
                    - id: geo.us.tbc
                      label: Before 500 BC
                      articles: 53
                      api_url: https://www.edgechat.ai/api/v1/geo/geo.us.tbc
                    - id: geo.us.t500
                      label: 500 BC to AD 999
                      articles: 79
                      api_url: https://www.edgechat.ai/api/v1/geo/geo.us.t500
                    page: 1
                    pages: 0
                    results: []
                    license:
                      name: Edgepedia Community License 1.0
                      url: https://www.edgechat.ai/edgepedia/license
                      summary: Free with credit, commercial use included. AI training is open to everyone. For other uses, organizations over USD 100M in revenue or 100M monthly users license separately.
          headers:
            RateLimit-Policy:
              $ref: '#/components/headers/RateLimit-Policy'
            ETag:
              $ref: '#/components/headers/ETag'
            Last-Modified:
              $ref: '#/components/headers/Last-Modified'
            Content-Digest:
              $ref: '#/components/headers/Content-Digest'
            Edgepedia-Corpus-Version:
              $ref: '#/components/headers/Edgepedia-Corpus-Version'
        '400':
          $ref: '#/components/responses/UnknownParameter'
        '404':
          description: Not found, or the switch for this route is off
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          headers:
            RateLimit-Policy:
              $ref: '#/components/headers/RateLimit-Policy'
        '405':
          $ref: '#/components/responses/MethodNotAllowed'
        '429':
          description: An error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          headers:
            RateLimit-Policy:
              $ref: '#/components/headers/RateLimit-Policy'
            RateLimit:
              $ref: '#/components/headers/RateLimit'
            Retry-After:
              description: Seconds to wait before the next request.
              schema:
                type: integer
        '503':
          description: Briefly unavailable; try again
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          headers:
            RateLimit-Policy:
              $ref: '#/components/headers/RateLimit-Policy'
      tags:
      - Geo
components:
  responses:
    MethodNotAllowed:
      description: '`method_not_allowed`: the API is read-only; use GET or HEAD (OPTIONS answers CORS preflights). The `Allow` header lists the methods.'
      headers:
        Allow:
          schema:
            type: string
          description: GET, HEAD, OPTIONS
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    UnknownParameter:
      description: '`unknown_parameter`: the request carries a query parameter this route does not read (or one given twice). Each route reads only the parameters listed for it.'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  headers:
    RateLimit-Policy:
      description: 'The limiter''s two windows, per IP address and per server instance (IETF RateLimit header fields): 600 requests a minute and 100,000 a day.'
      schema:
        type: string
        example: '"minute";q=600;w=60, "day";q=100000;w=86400'
    RateLimit:
      description: 'On a 429 only: the window that was exceeded, no requests remaining (r=0), and the seconds until it resets (t).'
      schema:
        type: string
        example: '"minute";r=0;t=42'
    Content-Digest:
      description: sha-256 of the body (RFC 9530).
      schema:
        type: string
    Edgepedia-Corpus-Version:
      description: The corpus release that answered.
      schema:
        type: string
    Last-Modified:
      description: The corpus release date (informational; only the ETag validates).
      schema:
        type: string
    ETag:
      description: A hash of the body; send it back as If-None-Match for a 304.
      schema:
        type: string
  schemas:
    ListGeoResponse:
      type: object
      properties:
        regions:
          type: array
          items:
            allOf:
            - $ref: '#/components/schemas/Topic'
            - type: object
              properties:
                children:
                  type: array
                  items:
                    $ref: '#/components/schemas/Topic'
        license:
          $ref: '#/components/schemas/License'
    GetGeoResponse:
      type: object
      properties:
        id:
          type: string
        label:
          type: string
        path:
          type: array
          items:
            $ref: '#/components/schemas/Topic'
          description: From the region down.
        articles:
          type: integer
        children:
          type: array
          items:
            $ref: '#/components/schemas/Topic'
        page:
          type: integer
        pages:
          type: integer
        results:
          type: array
          items:
            $ref: '#/components/schemas/ArticleSummary'
        license:
          $ref: '#/components/schemas/License'
    ArticleSummary:
      type: object
      properties:
        id:
          type: string
        slug:
          type: string
        title:
          type: string
        topic:
          type:
          - string
          - 'null'
          description: The top-level branch of the topic tree the article is under. Its own topic is the last entry of the article's `topic_path`.
        excerpt:
          type: string
          description: The corpus snippet when available, otherwise the article opening as plain text. Older listing excerpts may end in an ellipsis (…).
        url:
          type: string
          format: uri
        markdown_url:
          type: string
          format: uri
        api_url:
          type: string
          format: uri
        snippet:
          type: string
          description: Optional corpus-authored summary, separate from the article opening. Present on corpus-v1.5 articles and their preview results.
        node:
          type: string
          description: Current concept-tree node of the article, when available. May change when the corpus tree is revised.
      required:
      - id
      - slug
      - title
      - excerpt
      - url
      - markdown_url
      - api_url
    Error:
      type: object
      properties:
        error:
          type: object
          properties:
            code:
              type: string
            message:
              type: string
            hint:
              type: string
            next:
              type: string
              format: uri
            did_you_mean:
              type: array
              items:
                type: object
                properties:
                  id:
                    type: string
                  slug:
                    type: string
                  title:
                    type: string
                  api_url:
                    type: string
          required:
          - code
          - message
      required:
      - error
    Topic:
      type: object
      properties:
        id:
          type: string
        label:
          type: string
        articles:
          type: integer
        api_url:
          type: string
          format: uri
      required:
      - id
      - label
      - api_url
    License:
      type: object
      properties:
        name:
          type: string
        url:
          type: string
          format: uri
        summary:
          type: string
        spdx:
          type: string
          example: LicenseRef-Edgepedia-Community-1.0
      required:
      - name
      - url
  parameters:
    fields:
      name: fields
      in: query
      required: false
      description: 'Comma-separated keys: each result (or the answer, when it has no results) keeps only these.'
      schema:
        type: string